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Quizlet was founded in October 2005 by Andrew Sutherland, who at the time was a 15-year old student, [2] and released to the public in January 2007. [3] Quizlet's primary products include digital flash cards, matching games, practice electronic assessments, and live quizzes. In 2017, 1 in 2 high school students used Quizlet. [4]
The AS and A2 marks are combined for a full A-level award. The A2-level is not a qualification on its own and must be accompanied by an AS-level in the same subject for certification. [14] A-level exams is a matriculation examination and can be compared to matura, the Abitur or the Baccalauréat.
In 2000, the A-level system was changed to examine students at the end of each of the two years of A-level study, rather than only at the end of the two years. The results of the first year's exam (AS-level) allowed students to drop subjects they find difficult after one year and to retake AS examinations to achieve a higher grade at that level ...
Test validity is the extent to which a test (such as a chemical, physical, or scholastic test) accurately measures what it is supposed to measure.In the fields of psychological testing and educational testing, "validity refers to the degree to which evidence and theory support the interpretations of test scores entailed by proposed uses of tests". [1]
On the other hand, there are higher-education programmes requiring only the B level exams. In such cases, the candidate taking an exam in a certain subject on the A level is credited more points than a candidate taking the B level exam: 1 point of the A level exam is worth 1.6 points of the B level exam. The three compulsory subjects are: [8]
The testing effect (also known as retrieval practice, active recall, practice testing, or test-enhanced learning) [1] [2] [3] suggests long-term memory is increased when part of the learning period is devoted to retrieving information from memory. [4]
Environmental chemistry is the scientific study of the chemical and biochemical phenomena that occur in natural places. It should not be confused with green chemistry , which seeks to reduce potential pollution at its source.
The rate of a reaction is the concentration of substrate disappearing (or product produced) per unit time (mol L −1 s −1).. The % purity is 100% × (specific activity of enzyme sample / specific activity of pure enzyme).
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